CA1011071A - Bonded composite material comprising a polyamide reinforcing element embedded in a vulcanized rubber - Google Patents

Bonded composite material comprising a polyamide reinforcing element embedded in a vulcanized rubber

Info

Publication number
CA1011071A
CA1011071A CA260,824A CA260824A CA1011071A CA 1011071 A CA1011071 A CA 1011071A CA 260824 A CA260824 A CA 260824A CA 1011071 A CA1011071 A CA 1011071A
Authority
CA
Canada
Prior art keywords
composite material
reinforcing element
vulcanized rubber
element embedded
bonded composite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA260,824A
Inventor
Edward F. Kalafus
Gerard E. Van Gils
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aerojet Rocketdyne Holdings Inc
Original Assignee
General Tire and Rubber Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Tire and Rubber Co filed Critical General Tire and Rubber Co
Application granted granted Critical
Publication of CA1011071A publication Critical patent/CA1011071A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00Layered products comprising a layer of natural or synthetic rubber
    • B32B25/02Layered products comprising a layer of natural or synthetic rubber with fibres or particles being present as additives in the layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/34Layered products comprising a layer of synthetic resin comprising polyamides
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/06Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/04Oxygen-containing compounds
    • C08K5/13Phenols; Phenolates
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L39/00Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions of derivatives of such polymers
    • C08L39/04Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C08L39/08Homopolymers or copolymers of vinyl-pyridine
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/04Condensation polymers of aldehydes or ketones with phenols only
    • C08L61/06Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J139/00Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
    • C09J139/04Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C09J139/08Homopolymers or copolymers of vinyl-pyridine
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2377/00Polyamides
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2321/00Characterised by the use of unspecified rubbers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/14Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/28Non-macromolecular organic substances
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S156/00Adhesive bonding and miscellaneous chemical manufacture
    • Y10S156/91Bonding tire cord and elastomer: improved adhesive system
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S525/00Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S525/935Matrix admixed with synthetic fiber
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/249921Web or sheet containing structurally defined element or component
    • Y10T428/249924Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y10T428/249933Fiber embedded in or on the surface of a natural or synthetic rubber matrix
    • Y10T428/249937Fiber is precoated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2933Coated or with bond, impregnation or core
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2933Coated or with bond, impregnation or core
    • Y10T428/2964Artificial fiber or filament
    • Y10T428/2967Synthetic resin or polymer
    • Y10T428/2969Polyamide, polyimide or polyester
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31725Of polyamide
    • Y10T428/31739Nylon type
    • Y10T428/31743Next to addition polymer from unsaturated monomer[s]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31725Of polyamide
    • Y10T428/3175Next to addition polymer from unsaturated monomer[s]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31725Of polyamide
    • Y10T428/31761Next to aldehyde or ketone condensation product
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31855Of addition polymer from unsaturated monomers
    • Y10T428/31859Next to an aldehyde or ketone condensation product
    • Y10T428/31877Phenol-aldehyde
CA260,824A 1972-11-29 1976-09-09 Bonded composite material comprising a polyamide reinforcing element embedded in a vulcanized rubber Expired CA1011071A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31052472A 1972-11-29 1972-11-29
US05380937 US3888805A (en) 1972-11-29 1973-07-19 Method for bonding polyamides to rubber, adhesive for the same, and adhesive coated polyamide reinforcing elements

Publications (1)

Publication Number Publication Date
CA1011071A true CA1011071A (en) 1977-05-31

Family

ID=26977449

Family Applications (2)

Application Number Title Priority Date Filing Date
CA181,730A Expired CA1003984A (en) 1972-11-29 1973-09-24 Method for bonding polyamides to rubber
CA260,824A Expired CA1011071A (en) 1972-11-29 1976-09-09 Bonded composite material comprising a polyamide reinforcing element embedded in a vulcanized rubber

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA181,730A Expired CA1003984A (en) 1972-11-29 1973-09-24 Method for bonding polyamides to rubber

Country Status (6)

Country Link
US (3) US3888805A (en)
CA (2) CA1003984A (en)
DE (1) DE2422769C3 (en)
FR (1) FR2274670A1 (en)
GB (1) GB1451880A (en)
NL (1) NL156745B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH614978A5 (en) * 1974-05-13 1979-12-28 Inventa Ag
GB1541409A (en) * 1975-04-25 1979-02-28 Dunlop Ltd Reinforced elastomeric articles
US4040999A (en) * 1976-06-03 1977-08-09 The General Tire & Rubber Company Pollution free method of making phenol formaldehyde resole tire cord dip and product
US4219452A (en) * 1978-05-19 1980-08-26 Amsted Industries Incorporated Composite friction element
US4197228A (en) * 1977-04-15 1980-04-08 Owens-Corning Fiberglas Corporation Impregnating composition
DE3011710A1 (en) * 1980-03-26 1981-10-01 Bayer Ag, 5090 Leverkusen METHOD FOR EQUIPING FISH NET
US4532275A (en) * 1981-02-03 1985-07-30 Teijin Limited Fiber-reinforced composite materials
US4387178A (en) * 1981-11-02 1983-06-07 Rogers Corporation Compressible soft asbestos free gasket material
EP0079718B1 (en) * 1981-11-05 1987-09-09 Ube Industries, Ltd. Fiber-reinforced rubber composition and production process thereof and fiber-reinforced elastic product
US4492779A (en) * 1981-12-07 1985-01-08 Thiokol Corporation Aramid polymer and powder filler reinforced elastomeric composition for use as a rocket motor insulation
US4725650A (en) * 1982-10-14 1988-02-16 Rogers Corporation Heat stable phenolic composition containing aramid fibers
US4510202A (en) * 1983-12-19 1985-04-09 E. I. Du Pont De Nemours And Company Adhesion activated aramid fiber
GB2213506B (en) * 1987-12-28 1991-09-04 Bridgestone Corp Adhesive treatment for nylon cords
US4820753A (en) * 1988-03-15 1989-04-11 The B. F. Goodrich Company Acoustic window and material therefor
US5173141A (en) * 1988-05-25 1992-12-22 Minnesota Mining And Manufacturing Company Preparing tape having improved tear strength
US5079066A (en) * 1988-05-25 1992-01-07 Minnesota Mining And Manufacturing Company Tape having improved tear strength
JPH0710929B2 (en) * 1988-11-14 1995-02-08 横浜ゴム株式会社 Rubber composition and fiber composite and hose
JPH0710928B2 (en) * 1988-11-14 1995-02-08 横浜ゴム株式会社 Rubber composition and fiber composite and hose
US5145544A (en) * 1989-08-01 1992-09-08 Minnesota Mining And Manufacturing Company Method for preparing tape having improved tear strength
US5118545A (en) * 1990-03-05 1992-06-02 The Goodyear Tire & Rubber Company Adhesion of aramid cord to rubber
DE69226461T2 (en) * 1991-03-13 1999-03-18 Bridgestone Corp Polyamide tire cord for rubber reinforcement
FR2722793B1 (en) 1994-07-19 1996-11-29 Atochem Elf Sa MATERIAL COMPRISING A POLYMER BASED ON POLYAMIDE BONDING ON AN EPDM RUBBER
US5654099A (en) * 1996-02-21 1997-08-05 Dayco Products, Inc. Method of improving adhesion between alkylated chlorosulfonated polyethylene (ACSM) or chlorosulfonated polyethylene (CSM), and resorcinol formaldehyde latex (RFL) treated polyester cord
US6203855B1 (en) 1999-08-13 2001-03-20 Xerox Corporation Process for preparing nonbleeding fluorinated carbon and zinc oxide filler layer for bias charging member
US6620476B2 (en) 1999-08-13 2003-09-16 Xerox Corporation Nonbleeding fluorinated carbon and zinc oxide filled layer for bias charging member
US6539698B2 (en) 2001-01-19 2003-04-01 Continental Ag Wrapped cord
US20020139465A1 (en) 2001-01-19 2002-10-03 Fidan Mehmet Sadettin Wrapped cord
US7165586B2 (en) * 2003-12-22 2007-01-23 The Goodyear Tire & Rubber Company Pneumatic tire with blended composite fiber cords
US8142316B2 (en) * 2006-12-05 2012-03-27 Veyance Technologies, Inc. Power transmission belts
US11534780B2 (en) 2017-11-14 2022-12-27 General Electric Company Spray nozzle device for delivering a restorative coating through a hole in a case of a turbine engine

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Publication number Priority date Publication date Assignee Title
US2429397A (en) * 1943-04-27 1947-10-21 Goodrich Co B F Method of adhering fibers to rubber
US2615826A (en) * 1946-08-02 1952-10-28 Wingfoot Corp Article comprising cord bonded to rubber by a vinylpyridine adhesive
US2875179A (en) * 1954-12-06 1959-02-24 Westinghouse Electric Corp Conversion of thermoplastic resins to thermoset resins
US3194294A (en) * 1958-05-07 1965-07-13 Gen Tire & Rubber Co Stable pre-prepared cord dip
US3023251A (en) * 1958-12-12 1962-02-27 Union Carbide Corp Process for producing aqueous trimethylolphenyl solutions
NL127527C (en) * 1964-04-08 1900-01-01
GB1050872A (en) * 1964-08-07 1900-01-01
US3304222A (en) * 1964-11-12 1967-02-14 Monsanto Co Adhesive composition comprising a rubber latex and a modified resorcinolaldehyde condensate
US3437122A (en) * 1965-03-01 1969-04-08 Gen Tire & Rubber Co Cord dip of improved stability
US3517082A (en) * 1967-06-26 1970-06-23 Commercial Solvents Corp Phenolic resin coating and process of coating
US3547729A (en) * 1967-10-27 1970-12-15 Firestone Tire & Rubber Co Method of adhering rubber to a fabric employing a novel adhesive composition
US3760578A (en) * 1968-09-23 1973-09-25 Firestone Tire & Rubber Co Nylon tire cords
US3609108A (en) * 1969-01-31 1971-09-28 Alfred J Kolka Rubber modified with tris-substituted resorcinol compounds
US3843484A (en) * 1972-06-20 1974-10-22 Teijin Ltd Method of bonding synthetic fibrous material to rubber using an aqueous dispersion-type adhesive

Also Published As

Publication number Publication date
FR2274670B1 (en) 1978-01-13
US3888805A (en) 1975-06-10
DE2422769B2 (en) 1978-02-02
US3991027A (en) 1976-11-09
NL156745B (en) 1978-05-16
GB1451880A (en) 1976-10-06
DE2422769C3 (en) 1978-10-05
US3956566A (en) 1976-05-11
CA1003984A (en) 1977-01-18
FR2274670A1 (en) 1976-01-09
NL7406204A (en) 1975-11-11
DE2422769A1 (en) 1975-11-13

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